I thought this was an interesting idea...
http://www.chicagotribune.com/business/chi-talk_moneydec03,0,2902061.story2 neighborhoods consider printing own currency for exclusive use in local stores
Residents from the Milwaukee neighborhoods of Riverwest and East Side are scheduled to meet Wednesday to discuss printing their own money. The idea is that the local cash could be used at neighborhood stores and businesses, thus encouraging local spending. The result, supporters hope, would be a bustling local economy, even as the rest of the nation deals with a recession.
"You have all these people who have local currency, and they're going to spend it at local stores," said Sura Faraj, a community organizer who is helping spearhead the plan. "They can't spend it at the Wal-Mart or the Home Depot, but they can spend it at their local hardware store or their local grocery store."
Incentives could be used to entice consumers into using the new money. For example, perhaps they could trade $100 U.S. for $110 local, essentially netting them a 10 percent discount at participating stores.